Bryant Lam Hong Sheng's answer to claire chen's Junior College 1 H2 Maths question.
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Simplify the inequality and you will get a quadratic eqn. Since there must be a real number x, it means that the quadratic eqn must have at least one real root. Hence, b^2 - 4ac is more than or equal to 0.
Date Posted:
7 years ago
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